Graduating triple valve.



PATE-NTED JUNE 16, 1908.

W. V. TURNER. GRADUATING TRIPLE VALVE.

APPLICATION FILED 0GT.20,1906.

. WITHFSSES 'mwamoa 7 W ,4, 4/ZL/W '30 crease has been made.

valve 8 and is adapted to communicate with the atmospheric port 19 ewlien the valye moves. to a lap posit-ion for cutting oll thd exhaust in graduating there- '5 lease from the brake eylinder.

The application or the brakes is. made in the usual s ay by reducing the train pipe pressure. Mter the brakes are applied, if it be de- 19 sired to grade down the brake cylinder pressure a 'eerteiri amount without entirely releasingthe seine, a slight'increase is made in the train pipe, pressure sufficient to move the triple valves to release position, Fig. 1, tl1erehf opening the brake cylinder exhaust and a so uncovering the supplemental reservoir port 15.

, By the closing of port 15 by the slide valve during the application of the brakes, the norof the main slide '20 mal maximumdcgree of pressure has been retained in the supplemental reservoir 17, so that when the slide valve is returned to release position this air, at a higher pressure than thatoi the reduced auxiliary reservoir and train pi e, flows into the valve chamber on the aural 'iary reservoir side of the triple.

valve piston and raises the pressure thereon above that of the trainiiipe on the opposite and momentary in- This causes the piston and slide valve to move out far enough to close the supplemental reservoir port and the brake cylinder exhaust. When the valve reaches this lap or graduated release position, as indicated iri'l ig. 3, theaddit'ional cavity 18 communicates by ort 19 with the atmosphere, thereby increasing the frictional resistance of the valve at this position so as to retard and arrest the movement of the valve to and prevent the same from traveling to its service position, Fig. 2, in which the service ggrt would be opened to the brake cylinder.

side, in which only a sma all positions of the valve, other than that shown in. Fig. 3, the atmospheric port 19 is as closed, so that this additional irictionalre sistance is exerted only at this pointin the travel of the valve.

Further reductions in ressure may be made in a similar manner y again increasing" the train pipe pressure a small amount, Whereujoonthe piston moves the valve to release position and opens the brake cylinder exhaust port and the supplemental reservoir port, so that a portion of the air is released from the hral re cylinder while the admission of compressed air from the supplemental reservoir again acts on the piston to move the valve out to lap or graduated release position, as shown in Fig. 3. In this manner the brake cylinder ressure maybe graded down to any desire degree.

Whenever a complete release of the brake is desired, a continuous the train pigs pressure inthe usual Way,-

6-5 thereby hol the triple valve .piston and the brake cylinder increase is made in access.

slide valve in full release position, since the pressure then continues to rise more rapidly on the train. pipe side of the iston than on the other side by the air flowing in from the supplemental reservoir.

it will be apparent that any desired source of air pressure may be used in lieu of the supplemental reservoir, or that other means may be employed for moving .the slide valve outward to close the brake cylin-' der exhaust.

Having now described my. invention, I what I c arm. as new and desire to secure by: Letters Patent 1s:

1. i l-triple valve valve for controlling the exhaust from. the brake cylinder, and means for increasing the device having a slide frictional resistance of the slide valve upon its seat at a certainpoint of its travel.

2. A triple valve device having a slide valve for controlling the exhaust from the brake cylinder, and rrieans for exposing a portion of the slide valve to lower or atmospheric pressure at a certain point of its travel to increase the frictional resistance. i

3. A triple valve device having a slide valve for controllin theiexhaust from the brake cylinder, an an additional cavity with an atmospheric (art for increasing the frictional resistance of point of its travel.

the valve at a certain- 4. A triple valve device having a slidevalve for controlling the exhaust from the brake cylinder, means for supplying compressed air irom an additional source to the auxiliary reservoir side of the tri le valve piston in the release position of t e valve,

and means for in leasing the frictional resistance of the val e at a point of its travel in which the brake cylinder exhaust is closed.-

5. A triple valve device comprising a pis ton subject to the opposing pressures of the train pipe and auxilia reservoir, a slide valve 0 erated by the piston for controlling the bra re cylinder exhaust, a port for ad froman additional mitting compressed air source to the auxiliary reservoir side of the piston in the release position of the valve, and means for exposing of the valve to atmospheric pressure in a p04- cylinderexhaust sition in which the brake an additional area i port and the additional'supply port are closed;

6." A triple valve device comprising a'piston subject to the opposing pressures of the train pipe and auxiliary reservoir, a slide valve 0 .erated by the PlStOD. for controlling the are e cylinder exhaust, a port for a mitt-lug compressed air from. an additional source to'the auxiliary reservoir side of the the valve, hn

piston in release eosition oi additional cavity in said valve, and an atmospheric port adapted to communicate Withssidcavity-in a position of the valve in which the brake cylinder exhaust isclosed.

7. A triple velve device having a slide valve for centrnlling the exhaust from the brake cylinder, and means for increasing the ell'eetive pressure with which the slide valve is heldegainst its seat at a certain point inits travel.

8. A triple velve device having a slide valve for controlling the exhaust, from the brake cylinder, and means for increasing the effective pressure with which the slide valve is held ageinst i bs seat by the fluid pressure at a certain psiltien of the valve in which the brake cylinder exhaust is closed.

9. A triple valve device having a slide valve for contrclling the exlnuisL from the 15 brake cylinder, enilmeens for increasing the frictional resislenee of said slide valve at. a point at which the brake cylinder exhaust is closed.

In testimony Whereef I have liereunte set 20 my hand. y

' WALTER V. TURNER] Witnesses:

R. F. EMERY,

J. B. MACDONALD. 

